part one of the makeover consisted of making a proper top off system. this is where I made a couple of things that I am very proud of.
1 was an electrical device that ACTUALLY WORKS!
the stand I put the Garden on is a corner desk that holds a decorative lamp and our router. there is absolutely no space for another gravity fed ATO that I am so fond of, so it will have to be pump operated.
I also wanted to use the existing float switch and float switch mount I made. it is very sleek and worked great to operate the solenoid valve for the gravity ATO.
this is where I ran into an issue. the solenoid drew so little power that u could run the straight 24v through the switch and solenoid in series with no issues. for the months I used the gravity ATO there wasn't a single issue with sticking. however this didn't fly with the pump I needed to use. testing in the bathroom, the float switch would engage without fault, but wouldn't turn off! :mad:
this was a big fear of mine as it would mean I'd have to buy a proper ATO.
“No!” I thought, I ain't paying over 100$ for something I can make! but the enthusiasm waned when I remembered its electrical.
I love mechanical engineering and machining, I'm not good at it but I can make most things I want/need, however when it comes to electrical, well let's say I have the interest, but that interest has led to multiple blown house fuses
I have rarely made anything electrical that has worked perfectly, but I was determined this time!
after mulling everything over in my electrically deficient brain, I realized this was far easier than I had anticipated.
all I needed was a simple MOSFET motor controller, and I had all the parts (from previous failed, fuse blowing projects)
I followed some online instructions, and made a simple ATO motor controller!!!
The thing is primitive, consisting of a voltage regulator to control the gate of a MOSFET and... that's it.
3 JST plugs connected the power supply to the float switch, which controlled the voltage regulator, which in turn turned on the MOSFET driving the pump. the voltage regulator drew little current, ensuring the float switch doesn't stick, and the MOSFET drives the pump at full speed with ease.
the whole thing is such a slick package too. the V-reg and MOSFET had the same shape/size, and so I soldered them together back to back (ground to ground) and heatshrinked it all together.